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<Title>Continuous Contour Coloring</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Continuous Contour Coloring</p>
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<img src="images/smoothcontour.jpg" width='600' height='500'>
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This example demonstrates continuous coloring of the <a href="ContourLayer.htm">ContourLayer</a>.<br><br>
By default, a contour layer will be discretely colored, which means the color will change in discrete steps according to the z level. In continuous coloring, the color will change continuously according to the z level. Continuous coloring can be enabled using <a href="ColorAxis.setColorGradient.htm">ColorAxis.setColorGradient</a> or <a href="ColorAxis.setColorScale.htm">ColorAxis.setColorScale</a>.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/smoothcontour.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The x and y coordinates of the grid
double[] dataX = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
double[] dataY = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

// The values at the grid points. In this example, we will compute the values using the formula z =
// Sin(x / 2) * Sin(y / 2).
double[] dataZ = new double[dataX.length * dataY.length];
for(int yIndex = 0; yIndex &lt; dataY.length; ++yIndex) {
    double y = dataY[yIndex];
    for(int xIndex = 0; xIndex &lt; dataX.length; ++xIndex) {
        double x = dataX[xIndex];
        dataZ[yIndex * dataX.length + xIndex] = Math.sin(x / 2.0) * Math.sin(y / 2.0);
    }
}

// Create a XYChart object of size 600 x 500 pixels
XYChart c = new XYChart(600, 500);

// Add a title to the chart using 18 points Times New Roman Bold Italic font
c.addTitle("Nano Lattice Twister Field Intensity        ", "Times New Roman Bold Italic", 18);

// Set the plotarea at (75, 40) and of size 400 x 400 pixels. Use semi-transparent black (80000000)
// dotted lines for both horizontal and vertical grid lines
c.setPlotArea(75, 40, 400, 400, -1, -1, -1, c.dashLineColor(0x80000000, Chart.DotLine), -1);

// Set x-axis and y-axis title using 12 points Arial Bold Italic font
c.xAxis().setTitle("Lattice X Direction (nm)", "Arial Bold Italic", 12);
c.yAxis().setTitle("Lattice Y Direction (nm)", "Arial Bold Italic", 12);

// Set x-axis and y-axis labels to use Arial Bold font
c.xAxis().setLabelStyle("Arial Bold");
c.yAxis().setLabelStyle("Arial Bold");

// When auto-scaling, use tick spacing of 40 pixels as a guideline
c.yAxis().setTickDensity(40);
c.xAxis().setTickDensity(40);

// Add a contour layer using the given data
ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ);

// Set the contour color to transparent
layer.setContourColor(Chart.Transparent);

// Move the grid lines in front of the contour layer
c.getPlotArea().moveGridBefore(layer);

// Add a color axis (the legend) in which the left center point is anchored at (495, 240). Set the
// length to 370 pixels and the labels on the right side.
ColorAxis cAxis = layer.setColorAxis(495, 240, Chart.Left, 370, Chart.Right);

// Add a bounding box to the color axis using light grey (eeeeee) as the background and dark grey
// (444444) as the border.
cAxis.setBoundingBox(0xeeeeee, 0x444444);

// Add a title to the color axis using 12 points Arial Bold Italic font
cAxis.setTitle("Twist Pressure (Twist-Volt)", "Arial Bold Italic", 12);

// Set color axis labels to use Arial Bold font
cAxis.setLabelStyle("Arial Bold");

// Use smooth gradient coloring
cAxis.setColorGradient(true);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "", "title='&lt;*cdml*&gt;X: {x|2}&lt;*br*&gt;Y: {y|2}&lt;*br*&gt;Z: {z|2}'")
    );

// Output Javascript chart model to support contour chart tooltips
viewer.setChartModel(c.getJsChartModel());
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Continuous Contour Coloring&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Continuous Contour Coloring
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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